Toolholder



Jan. 25, 1949. B, BARRETT 7 2,460,210

TOOL HOLDER Filed Jan. 19, 1946 INVENTOR.

AT] GENE Y Patented Jan. 25, 1949 UNITED STATES PATENT OFFICE 2,460,210 TOQLHOL'DER Bracell Barrett, Galena Park,1'1ex. Application January 19, 1946, Serial No. 642,332

1 Claim. 1

a tool holder of the character described having a conventional shank adapted to be inserted into a standard type of machine spindle and having a floating adapter at theouter end of the shank to receive the tool to be usedin the work, with a novel connecting and driving means between the shank andtheadapten'which permits the adapter and .tool to move angularly in relation to the shank so that the tool mounted on the adapter will follow the center lineoi a bore inthe work, even though the center line of the bore may be in angular relation to the center line of the shank.

It is a further object of the invention to provide atool holder of the character described of such construction that the tool mountedtherein will be normally held in direct alignment with the shank.

With the above and other objects in view the invention has particular relation to certain novel features of construction, arrangement of parts and use, an example of which is given in this specification and illustrated in the accompanying drawings, wherein:

Figure 1 is a longitudinal sectional view of the holder.

Figure 2 is a fragmentary view of the shank,

viewed on the line 2-2 of Figure 1.

Figure 3 is a cross sectional View taken on the line 33 of Figure 1.

Figure 4 is a cross sectional view taken on the line 4-4 of Figure 1.

Figure 5 is a cross sectional view taken on the line 5-9-5 of Figure 1, and I Figure 6 is an inner end view of the floating adapter.

Referring now more particularly to the drawings, wherein like numerals of reference designate the same parts in each of the figures, the numeral l designates a shank of conventional form and adapted to be inserted into the spindle of a standard machine.

On the outer end of the shank there is a hollow body 2, preferably formed integrally with the shank and of somewhat greater diameter than the diameter of the shank.

The outer end of the shank has a deep socket 3 2 which'contains a coil pressure spring 4 and inserted into the sockets, against said spring, there is :a ball'retainer 5, whose outer face hasxa concaved depression Gin which the ball '1 isseate'd.

Mounted in'the inner end of the body 2 there'is a circular plate forming a'floating driver=8 which has a central opening 9,'in which the ball I is located. The floating driver 8 has opposed radial marginal grooves it, Ill. Drive pins II, II are anchored to the bottom of the body and have enlarged circular heads located 'in'the grooves 10, thus clutching the driver 8 with the body, for rotation therewith.

In the body there is a floating adapter 12 which A has .an external, annular, inwardly directed shoulder l3 and an outwardly tapering shoulder Surrounding the adapter, and interposed between the driver and the shoulder I3, there is a coil spring l5.

Screwed into the'outer end of the body there is a gland it having an external, annular flange which abuts said end and whose inner end is tapered to (conform to the taper of the shoulder Said tapering parts are normally held in abutting position by means of the spring 15 so that the adapter and the tool therein will be maintained in axial alignment with the shank.

The inner end of the adapter has a concave recess l! to receive the ball i and also has the radial marginal slots I8, [8 at right angles to the grooves Hi. There are the pins l9, l9 which are pressed into the driver 8 and which have enlarged circular heads which work in the slots I8 so as to clutch the driver with the floating adapter.

There is a slight clearance between the heads of the pins H and the slots [0 and also a slight clearance between the pins l9 and the slots l8 so as to give the tool holder the required amount of flexibility without the binding of parts.

Mounted on the outer end of the adapter there is a locking ring 26 which has an inside double cam-shaped groove 2| and opposite said groove, through the wall of the adapter l2, there is an inwardly converging opening 22 in which a retaining ball 23 works. This ball may be inserted through an opening 24 in the locking ring 20 and retained therein by means of a plug 25 screwed into said opening.

' The outer end of the adapter'is provided with a socket 26 for the reception of the shank of a reamer, or other tool. When the shank of said tool is inserted in the socket the locking ring 20 may be turned so as to cause the camshaped bottom of the groove 2| to force the retaming ball 23 inwardly into the position shown in dotted lines in Figure 3, and into a recess in the tool shank so as to lock the tool in the adapter. In looking the tool in the adapter the locking ring may be turned in either direction, depending on the direction in which the tool and tool holder are to be rotated. When it is desired to release the tool from the adapter the locking ring 20 may be turned until the double camshaped groove 2| is centered relative to the opening 22 to allow the retaining ball 23 to move outwardly into the position shown in Figure 1, to release the tool shank so that the tool can be removed.

Normally the spring IE will hold the adapter and tool in axial alignment with the holder shank l by holding the tapering shoulder l closely against the tapering seat of the gland so that the tool will properly align with the work; however, when the tool is applied to the work the pressure will unseat the tapering shoulder M from the tapering seat of the gland 16, the springs 4 and I5 yielding to permit this, and should the work not be precisely axially aligned with the machine spindle and shank l the adapter and tool will automatically align themselves with the central line of the bore being drilled,

or reamed, by the tool, thus preventing inaccuracy in the work and without disengaging the operative connection between the shank l and the floating adapter 12.

The drawings and description are illustrative merely while the broad principle of the invention will be defined by the appended claim.

What I claim is:

A tool holder comprising, a shank whose outer end is formed with a hollow body of greater diameter than the shank, said shank being formed with a deep socket, a coil pressure spring in said socket, a ball retainer seated on the spring within said socket and whose outer face is formed with a concaved depression, a ball seated in the depression, a circular plate mounted within the body and forming a floating driver which is provided with a central opening in which said ball is located, said driver having opposed radial marginal grooves, drive pins anchored to the bottom of the body and extending loosely into said grooves to clutch the driver with the body for rotation therewith, a floating adapter in the body provided with an outer end, tool-receiving, socket and with an external, annular, inwardly directed shoulder and an outer tapering shoulder, a coil spring around the adapter and interposed between the driver and the inwardly directed shoulder, a gland screwed into the outer end of the body and having an external annular flange which abuts said outer end and whose inner end is tapered to conform to the taper of said tapering shoulder, said spring around the adapter normally holding said tapering parts in contact, said adapter being provided with a concaved recess in its inner end to receive said ball and being provided with radial marginal slots at angles to said grooves, pins on the driver having heads which work loosely in said marginal slots to clutch the driver with the floating adapter, a locking ring on the body having an inside, double cam-shaped groove which converges into a central opening through the adapter and a ball retained insaid double camshaped groove and working through the opening thereof.

BRACELL BARRETT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,398,679 Clark Nov. 29, 1921 1,566,553 Maisch Dec. 22, 1925 1,831,382 Gairing Nov. 10, 1931 FOREIGN PATENTS Number Country Date 47,843 Sweden Oct. 6, 1920 106,736 Great Britain June 7, 1917 

